4.1.12. Service of a bent shaft and radical bearings
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The micrometer and the dial measuring instrument of plunger type will be necessary for implementation of the procedures described below. |
Removal
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- Take the engine from the car, then remove from it a head of cylinders, the case pallet, a maslozabornik of the oil pump, a cover of a gas-distributing belt, gas-distributing and driving chains and a flywheel / a driving disk.
- Give fixing bolts and, having carefully hooked, remove the holder of a back epiploon of a bent shaft from the block of cylinders and a pin of a shaft.
- Make sure available on rods and covers of their lower heads of identification tags (in case of need put them independently).
- Give fixing nuts and uncover the lower heads of rods, putting them as placement on the engine. Slightly raise rods, having removed their lower heads from shaft necks, but not pushing out pistons from cylinders.
- Having entered edges of the measuring probe between a cheek of a crank and the sixth radical bearing, check an axial side play of a bent shaft. Push a shaft against the stop in a first line of the central radical bearing, then for definition of an axial side play take away a shaft against the stop forward.
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Alternatively axial side play of a shaft can be defined by means of the digital measuring instrument of the plunger type established opposite to a shaft pin end face (see an accompanying illustration). |
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- If the axial side play exceeds admissible value (see size tables and adjustments at the end of the Management), replace the central radical bearing assembled.
- By means of the measuring Plastigage set check gaps in radical bearings of a bent shaft:
- Uncover the first bearing and carefully wipe a neck of a shaft and an insert of the bearing pure неворсящейся with rags.
- Lay a piece of the calibrated plastic wire from measuring set (on length equal to bearing width) along a shaft neck.
- Establish a cover of the bearing and tighten bolts of its fastening with the required effort.
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Do not rotate a shaft at the measuring wire laid on his neck. |
- Give bolts and carefully uncover with the lower insert of the bearing.
- On the scale applied on packing of the Plastigage set measure width of the flattened-out calibrated wire, having determined by that gap size in the bearing.
- The widest site of the flattened-out wire corresponds to the minimum gap and vice versa.
- Similarly check gaps in the remained bearings.
- Carefully take a bent shaft from an engine case, watching that did not drop out or the top inserts of radical bearings were not damaged (if they are reused).
- If inserts are supposed to be replaced, take old of the beds in the block.
- Establish a new back epiploon of a bent shaft in the holder.
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Check of a state
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- Check radical and conrod necks of a bent shaft for existence of signs of wear, conicity and ovality. At excess by degree of wear of admissible sizes (see size tables and adjustments at the end of the Management) corresponding (radical or conrod) necks should be pierced to the closest of the standard repair sizes, having picked up the corresponding size (with belittling) inserts. Remember that even in case of wear or defect of only one of necks all necks in a set are subject to a pro-point (radical or conrod respectively).
- If wear degree such is that the pro-point of necks will not help to correct a situation, the bent shaft has to be replaced.
- Check the persistent surfaces of the central radical bearing for existence of cavities and traces of operation. In case of need replace inserts of the persistent bearing that has to bring an axial side play of a bent shaft into accord with standard requirements (see size tables and adjustments at the end of the Management).
- Even in case gaps in radical bearings are recognized as satisfactory, check their inserts for existence of scratches, zadir, flakings, cavities and traces of development. In case of need replace defective inserts in pairs on new, the corresponding size.
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Installation
Installation is made upside-down.
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- Track reliability of passability of all maslotok and do not forget to wipe carefully all necks (radical and conrod) pure неворсящейся with rags.
- Carefully wipe all new, or old inserts, then oil their pure motive. Track correctness of installation inserts in the corresponding beds of the block, covers or heads of rods.
- Lay a bent shaft in the block of cylinders, sending conrod necks to heads of the corresponding rods.
- Put on covers of bearings the corresponding rods and bearings of the block, tighten fixing bolts / nuts with the required effort (see size tables and adjustments at the end of the Management).
- If replaced inserts of bearings, check gaps in them by means of the measuring Plastigage set.
- Establish the holder of a back epiploon, gas-distributing and driving chains, a flywheel / a driving disk and the other removed components.
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